[PowerPC] Add rldcr/rldic instructions

This adds pattern for the rldcr and rldic instructions (the last instruction
from the rotate/shift family that were missing).  They are currently used
only by the asm parser.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184833 91177308-0d34-0410-b5e6-96231b3b80d8

[PowerPC] Add extended rotate/shift mnemonics

This adds all missing extended rotate/shift mnemonics to the asm parser.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184834 91177308-0d34-0410-b5e6-96231b3b80d8